Open circulatory system is found in (a) Man (b) Insects/Cockroach (c) Reptiles (d) Aves
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Insects, like all other arthropods, have an open circulatory system which differs in both structure and function from the closed circulatory system found in humans and other vertebrates.
Whereas our blood is confined within blood vessels, insect blood, called hemolymph, flows freely throughout the body.
Because hemolymph flows freely in the body, this single fluid brings oxygen and nutrients to the organs and removes waste products.
Many insects have a tracheal system that brings oxygen into their bodies through a series of tubes.
Explanation:
Hence your answer is option B
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